CN103052076B - A kind of discrete narrow band realizes the method for broadband data transmission - Google Patents
A kind of discrete narrow band realizes the method for broadband data transmission Download PDFInfo
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Abstract
The invention discloses a kind of method that discrete narrow band realizes broadband data transmission, have including step: power system private radio frequency range is modeled by (1)；(2) determine spectrum information according to frequency spectrum perception technology and find Radio Resource free time frequency range；(3) the described idle frequency range found is carried out carrier aggregation.The present invention passes through frequency spectrum perception technology, changes the condition of the discrete narrow band of the existing communication band of electric power, balanced frequency resource, idle channel is carried out carrier aggregation, effectively make use of frequency resource；Present invention accomplishes electric power radio communication power information collection, the demand of the business such as important operation and operationlocation such as electric power video/picture control electric power construction field, transmission line of electricity key sections, emergency command and accident treatment scene, transformer station.
Description
Technical field
The present invention relates to wireless communication system networking arts, be specifically related to a kind of method that discrete narrow band realizes broadband data transmission.
Background technology
Power communication system is to unify the basic support platform that strong intelligent grid is built, and is unify the various management of strong intelligent grid and control the transmission platform that information real time bidirectional is mutual.Wherein Wireless Broadband Communication Systems can cover wide variety of user in each Grid easily, quickly and safely business be pushed directly to electrical network end, plays a significant role in power communication system.
Existing electric power cordless communication network comprises 230M radio station private network, Mobitex private network, GPRS public network (renting), CDMA public network (renting) etc., wherein public network communication can not meet the application demand of intelligent grid in transfer rate, real-time and power system capacity, it is necessary to sets up electric power Wireless Broadband Communication Systems；In frequency spectrum resource, power system private radio frequency range is generally 40 discrete carriers of 223MHz-235MHz, and wherein the bandwidth of each carrier wave is 25KHz；In the particularity of communication service, electric power wireless communication system requires that upstream rate is more than downstream rate.For problems such as these 40 discrete frequencies, each limited, channel securities of frequency transmission capacity, it is impossible to meet the real-time of electric power, reliability, high band wide data transmission application requirement, seriously constrain power telecom network and serve the ability of electrical network.And in the face of current power communication service demand no longer only defeated, join, become, the business such as use, more business derive from the business such as important operation and operationlocation such as power information collection on a large scale, electric power video/picture control electric power construction field, transmission line of electricity key sections, emergency command and accident treatment scene, transformer station.Present stage energy communication service demand, wide bandwidth, high uplink throughput, highly reliable extendible frequency band completes.
Summary of the invention
For the deficiencies in the prior art, the present invention provides a kind of method that discrete narrow band realizes broadband data transmission, adds frequency bandwidth, improves the availability of frequency spectrum, decreases the interference between frequency, it is ensured that the method uploading data accuracy.
The method that a kind of discrete narrow band provided by the invention realizes broadband data transmission, it thes improvement is that, described method comprises the steps:
(1) power system private radio frequency range is modeled；
(2) determine spectrum information according to frequency spectrum perception technology and find Radio Resource free time frequency range；
(3) the described idle frequency range found is carried out carrier aggregation.
Wherein, step (1) determines the band bandwidth of 230MHz and the hop count of discrete frequency range after power system private radio frequency range is modeled according to model.
Wherein, step (2) described spectrum information has included whether that signal takies frequency spectrum, if there being signal to take, taking the signal type of frequency spectrum, utilizing frequency, time slot, code channel, signal modulation system, signal waveform and signal bandwidth.
Wherein, finding Radio Resource free time frequency range described in step (2) is use frequency spectrum perception technology, cognition network adds a base station, carry out the collision detection of communication channel in same frequency range, perception data is sent to base station by DCCH by cognitive user, base station, by the perception data of multiple cognitive user is analyzed, detects idle frequency range.
Wherein, the described idle frequency range found is carried out carrier aggregation and refers to that the data of each OFDM member carrier carrying are modified by employing by step (3), at idle frequency range transmitting data, it is achieved spectral carriers is polymerized.
Wherein, the data of each OFDM member carrier carrying are carried out zero padding, and does corresponding change.
Wherein, step (2) if finding busy frequency range according to frequency spectrum perception technology, then closes the corresponding subcarrier of busy frequency range.
Compared with the prior art, the invention have the benefit that
The present invention passes through frequency spectrum perception technology, changes the condition of the discrete narrow band of the existing communication band of electric power, balanced frequency resource, idle channel is carried out carrier aggregation, effectively make use of frequency resource；Present invention accomplishes electric power radio communication power information collection, the demand of the business such as important operation and operationlocation such as electric power video/picture control electric power construction field, transmission line of electricity key sections, emergency command and accident treatment scene, transformer station.
Accompanying drawing explanation
Fig. 1 is the state model of discrete frequency provided by the invention.Wherein, black surround is unavailable frequency spectrum, and white edge is usable spectrum.
Fig. 2 is perception idle channel flow chart provided by the invention.
Fig. 3 is the signal spectrum figure of OFDM provided by the invention.
Fig. 4 is the flow chart realizing carrier aggregation based on OFDM provided by the invention.
Fig. 5 is the flow chart that a kind of discrete narrow band provided by the invention realizes the method for broadband data transmission.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The method that a kind of discrete narrow band that the present embodiment proposes realizes broadband data transmission, its flow chart is as it is shown in figure 5, comprise the steps:
(1) power system private radio frequency range is modeled；The band bandwidth of 230MHz and the hop count of discrete frequency range is determined according to model；
(2) determine spectrum information according to frequency spectrum perception technology and find Radio Resource free time frequency range；If what find according to frequency spectrum perception technology is busy frequency range, then close the corresponding subcarrier of busy frequency range.
Described spectrum information has included whether that signal takies frequency spectrum, if there being signal to take, taking the signal type of frequency spectrum, utilizing frequency, time slot, code channel, signal modulation system, signal waveform and signal bandwidth.
Described find Radio Resource free time frequency range be use frequency spectrum perception technology, cognition network adds a base station, carry out the collision detection of communication channel in same frequency range, perception data is sent to base station by DCCH by cognitive user, base station, by the perception data of multiple cognitive user is analyzed, detects idle frequency range.
(3) the described idle frequency range found being carried out carrier aggregation, the described idle frequency range being about to find carries out carrier aggregation and refers to that the data of each OFDM member carrier carrying are modified by employing, at idle frequency range transmitting data, it is achieved spectral carriers is polymerized.Wherein, the data of each OFDM member carrier carrying are modified, the present embodiment illustrates the process of spectrum aggregating for system transmitting terminal: the subcarrier corresponding to all busy frequency spectrums perceived is carried out data padding by OFDM, data bit after zero padding is carried out serial/parallel conversion, and is mapped on each subcarrier of OFDM symbol after data are modulated；After inserting pilot symbols into corresponding subcarrier, generate time-domain signal after the symbol on all subcarriers is carried out inverse Fourier transform, and it is carried out parallel/serial conversion；Insert after CP in each OFDM symbol, carry out analog digital conversion and upconvert to emission band carries out signal transmission, achieving spectrum aggregating by above procedure.As shown in Figure 4.
Wherein:
As it is shown in figure 1, be the state model of discrete frequency, 230MHz network system bandwidth range be 223.525MHz to 231.650MHz altogether for 7800KHz, the bandwidth of 40 sections of usable spectrums respectively M1, M2 ..., Mn, wherein n=1,2 ..., 40.
As shown in Figure 2, the present embodiment have employed the awareness technology of concentration: several cognitive user (i.e. CR, the present embodiment is 3 CR) adopt the presence or absence of energy measuring perception primary user (PU), channel between primary user and secondary user is estimated simultaneously, obtain its channel impulse response h.Afterwards the information relevant with energy measuring and channel impulse response h are passed to fusion decision center (Fc, FusionCenter) by DCCH (DCC).Merging decision center by the algorithm based on channel impulse response weighting, make the judgement existed with or without primary user, idle frequency range is sent to carrier aggregation mechanism.
By 230MHz frequency range is carried out frequency spectrum perception, it is thus achieved that the wherein center frequency point of idle frequency range, amounting to 40, each band bandwidth is 25kHz.
As it is shown on figure 3, be the signal spectrum figure of OFDM: this 230MHz band bandwidth is that 7800KHz, f0 ~ f (N-1) represents total N number of subcarrier frequency range, the mid frequency that f (N-1) is last frequency range.Carry out OFDM modulation, the OFDM subcarrier width adopted is 7.5kHz, whole bandwidth is used as the width of a member carrier, then member carrier comprises sub-carrier number is 7800kHz/7.5kHz=1040, adjacent sub-carrier mid frequency interval, each subcarrier bandwidth 1/NT (Ts is row symbol period length, and N is parallel channel number, and NTs is an OFDM symbol Cycle Length).
As shown in Figure 4, it is that the present embodiment realizes the flow chart of carrier aggregation based on OFDM: carry out OFDM data zero padding modulation as shown in the figure: the transmitting terminal in system modulates the functional module adding data padding in flow process at existing OFDM, subcarrier corresponding to all busy frequency spectrums perceived is carried out data padding, so that the data stream after zero padding is after OFDM modulates, the mid frequency of each modulated subcarriers ensures that its sideband does not drop on outside mandate frequency range.
Regard the symbol sum on the synchronization parallel channel after zero padding as an OFDM symbol X (t), with the interval of Δ t=NTs (Ts is for string character Cycle Length), X (t) is sampled, it is possible to obtain its discrete form:
In formula, m=0,1 ..., N-1；N is 1040.According to Nyquist sampling theorem it can be seen that these components are carried out D/A change with △ t interval, it is possible to obtain original analogue signal.
At the receiving terminal of system, the inverse transformation being transmitted end can obtain original signal.
The subcarrier frequency range of 7.5KHz is used by the method for Fig. 4, carry out subcarrier polymerization, 84 subcarriers of combined polymerization, the effective bandwidth after polymerization is 630kHz (84*7.5kHz), under total available bandwidth 40*25kHz=1000kHZ, the availability of frequency spectrum has reached 63%.According to the efficiency index 2.5 ~ 5bps/Hz under LTE continuous frequency spectrum, then cognitive radio herein under system under discrete spectrum condition spectrum efficiency can reach 1.575 ~ 3.15bps/Hz, under 40 discrete frequencies (1000KFz bandwidth), message transmission rate can reach 1.575～3.15bpsMbps.Thus demonstrate present invention achieves discrete narrow band become broadband data transmission.
Finally should be noted that: above example is only in order to illustrate that technical scheme is not intended to limit, although the present invention being described in detail with reference to above-described embodiment, those of ordinary skill in the field are it is understood that still can modify to the specific embodiment of the present invention or equivalent replacement, and without departing from any amendment of spirit and scope of the invention or equivalent replace, it all should be encompassed in the middle of scope of the presently claimed invention.
Claims (2)
1. the method that a discrete narrow band realizes broadband data transmission, it is characterised in that described method comprises the steps:
(1) power system private radio frequency range is modeled；
(2) determine spectrum information according to frequency spectrum perception technology and find Radio Resource free time frequency range；
(3) the described idle frequency range found is carried out carrier aggregation；
Step (1) determines the band bandwidth of 230MHz and the hop count of discrete frequency range after power system private radio frequency range is modeled according to model；
Finding Radio Resource free time frequency range described in step (2) is use frequency spectrum perception technology, cognition network adds a base station, carry out the collision detection of communication channel in same frequency range, perception data is sent to base station by DCCH by cognitive user, base station, by the perception data of multiple cognitive user is analyzed, detects idle frequency range；
Step (2) if finding busy frequency range according to frequency spectrum perception technology, then closes the corresponding subcarrier of busy frequency range；
The described idle frequency range found is carried out carrier aggregation and refers to that the data of each OFDM member carrier carrying are modified by employing by step (3), at idle frequency range transmitting data, it is achieved spectral carriers is polymerized:
The data of each OFDM member carrier carrying are carried out zero padding, subcarrier corresponding to all busy frequency spectrums perceived is carried out data padding by OFDM, data bit after zero padding is carried out serial/parallel conversion, and is mapped on each subcarrier of OFDM symbol after data are modulated；After inserting pilot symbols into corresponding subcarrier, generate time-domain signal after the symbol on all subcarriers is carried out inverse Fourier transform, and it is carried out parallel/serial conversion；Insert after CP in each OFDM symbol, carry out analog digital conversion and upconvert to emission band carries out signal transmission.
2. the method for claim 1, it is characterized in that, step (2) described spectrum information has included whether that signal takies frequency spectrum, if there being signal to take, taking the signal type of frequency spectrum, utilizing frequency, time slot, code channel, signal modulation system, signal waveform and signal bandwidth.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103347301B (en) * | 2013-07-09 | 2016-04-20 | 深圳供电局有限公司 | A kind of is method and the device of many subbands user terminal distributing radio resource |
| CN104270767A (en) * | 2014-09-30 | 2015-01-07 | 国家电网公司 | Method suitable for enabling wireless power private network to be broadband |
| CN106100810A (en) * | 2016-06-16 | 2016-11-09 | 北京汇通金财信息科技有限公司 | Communicator and method based on carrier aggregation technology |
| CN106304096A (en) * | 2016-08-31 | 2017-01-04 | 国网河南省电力公司开封供电公司 | The method and apparatus carrying out spectrum management in electric power radio communication |
| CN109275190B (en) | 2017-07-17 | 2021-10-26 | 华为技术有限公司 | Communication method and device |
| CN109995486B (en) * | 2017-12-29 | 2021-10-22 | 华为技术有限公司 | Data transmission method and device |
| CN111801956A (en) * | 2018-03-16 | 2020-10-20 | 华为技术有限公司 | Communication method and communication device |
| CN110167069A (en) * | 2019-04-16 | 2019-08-23 | 国网浙江省电力有限公司绍兴供电公司 | A kind of more Narrowband wireless terminals polyplants applied to electric power wireless private network |
| CN111162759B (en) * | 2020-01-06 | 2023-04-28 | 山东电力工程咨询院有限公司 | Filter optimization design method and system in carrier aggregation |
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| CN101990231A (en) * | 2009-07-31 | 2011-03-23 | 华为技术有限公司 | Method, system, central node and sensing node for determining idle frequency band |
| CN102223640A (en) * | 2011-06-03 | 2011-10-19 | 中兴通讯股份有限公司 | System and method for sharing dynamic frequency spectrum |
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| CN101521526A (en) * | 2009-03-30 | 2009-09-02 | 哈尔滨工业大学 | Method for optimal joint idle spectrum detection of cognitive radio |
| CN101990231A (en) * | 2009-07-31 | 2011-03-23 | 华为技术有限公司 | Method, system, central node and sensing node for determining idle frequency band |
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